STERNA. 311 



Key to the Species. 



a. Mantle grey. 



'. Crown black in the breeding-season. 

 a". Large Terns, wing above 11 ; tarsi black 



or blackish. 

 a 3 . Bill black throughout ; tarsus longer 



than mid-toe and claw S. anglica, p. 311. 



b 3 . Bill black, the tip yellow ; tarsus not 



longer than mid-toe and claw .... S. cantiaca, p. 312. 

 c 3 . Bill yellow ; a distinct nuchal crest. 

 # 4 . No white forehead in breeding- 

 plumage ; wing 12 S. media, p. 313. 



# 4 . A white forehead always; wing 14. S. bergii, p. 314. 

 b". Middle-sized Terns ; wing 8 to ll'o. 

 d 3 . Tarsi yellow or red. 

 t' 4 . Bill orange-yellow. 



a 5 . Bill stout; wing 11; abdomen 



white S. seena, p. 31 5. 



b 5 . Bill slender ; wing 9 ; abdomen 



black in breeding-season S. meZawypster, p. 310. 



d 4 . Bill red or dusky. 



c 5 . Lower parts dark vinaceous grey. S. albigena, p. 317. 

 d*. Lower parts pale grey or white, 

 outermost rectrices with dark 



grey outer webs S. flumatilis, p. 318. 



e 5 . Lower parts white or roseate, 

 outermost rectrices almost white 



throughout , S. dougalli, p. 319. 



e 3 . Tarsi blackish ; wing 1O5 S. lonyipennis, p. 319. 



c". Small Terns ; wing less than 8. 



y 3 . Shafts of primaries white in adults. . S. sinensis, p. 320. 

 ff 3 . Shafts of first two primaries brown 



or brownish S. minuta, p. 321. 



h 3 . Shafts of first three primaries 



blackish S. saundersi, p. 321. 



b'. Crown always white, nape and band 

 through eyes black ; bill black ; tarsi dark 



brown ; wing 8'5 S. melanauchen, p. 322. 



b. Mantle dark brown. 



c'. Wing 9-5 S. ancestheta, p. 323. 



d'. Wing 11-5 S.fuliyinosa, p. 324. 



1499. Sterna anglica. The Gull-billed Tern. 



Sterna anglica, Mont. Orn. Diet. Suppl. (1813) ; Hume, Cat. no. 983 ; 



Leffffe, Birds Ceyl. p. 1011; Tidal, S. F. ix, p. 94; Butler, ibid. 



p. 440 ; Reid, S. F. x, p. 86 ; Gates, B. B. ii, p. 422 ; Barnes, 



Birds Bom. p. 428 ; Hume, S. F. xi, p. 349 ; Oates in Hume's 



N. $ E. 2nd ed. iii, p. 304. 

 Gelochelidon anglica, Bonap. Comp. List B. Eur. 8f N. Amer. p. 61 ; 



Blyth, Cat. p. 290 ; Jerdon, B. I. iii, p. 836 ; Hayes Lloyd, Ibis, 



3878, p. 421 ; Ball, S. F. iv, p. 237 ; Hume, ibid. pp. 294, 414 ; 



Hume $ Dav. S. F. vi, p. 491 ; Davids. $ Wend. S. F. vii, p. 93; 



Cripps, ibid. p. 313 ; Biddulph, Ibis, 1881, p. 102, 1882, p. 290 ; 



Sounders, Cat. B. M. xxv, p. 25. 

 Gelichelidon nilotica, Stoliczka, J. A. S. B. xli, pt. 2, p. 2-56. 



